Dental engine



(No Model.)

I. G. LEEK.

DENTAL ENGINE.

NG. 397,990. Patented Feb. 19,' 1889.

UNITED STATES PATENT OEEICE.

IRA G. LEEK, OF SAN FRANCISCO, CALIFORNIA.

DENTAL ENGINE.

SPECIFICATION forming part of Letters Patent No. 397,990, dated February 19, 1889.

' Application filed February 16 1888. Serial No. 264,235. (No model.)

T all whom it may concern:

Be it'known that I, IRA G. LEEK, of the city and county of San Francisco, State of California, have invented an Improvement in Dental Engines; and I hereby declare the follow ing to be a full, clear, and exact description of the same.

My invention relates to the class of dental engines, and especially to the cranes orbrackets by which the flexible power-conveyer and hand-pieceA are suspended from the wall, and may have imparted to them such variety of movement as will adaptthe tool or bit carried in the han d-piece to work in an y required position with facility.

My invention consists in the constructions and combinations ot' devices, which I shall hereinafter describe and claim.

The object of my invention is to provide for the proper variety of movement for the hand-piece which will enable the use of the engine in all possible positions.

Referring to the accompanying drawings, Figure l is a view of my dental engine. Fig. 2 is a longitudinal section through the sleeve C. Figs. and I are longitudinal sections through the arm D at the bearing I. Fig. 5 is a longitudinal section of the arm at its joint.

A is a bracket lixed to the wall B. C is a sleeve, the rear end of which is connected with the bracket by means of the vertical pivot c, so that said sleeve may have a movement in a horizontal plane.

D is the crane-arm, made of a hollow or tubular piece, which is divided into sections united by the hinge d, which permits the sections to be turned to an angle with eachother. The rear end ot' the arm is tted into the sleeve C and adapted to turn therein, so as to have an axial movement. The connection is rendered secure and the joint controlled by means of a set-screw, c', which presses down a split portion, c2, of the sleeve upon the arm within and binds it with more or less force, so that said arm maybe madeto turn as treely as required. Into the outer or forward end of the arm D is fitted the sheath E, which incloses theflexiblc power-conveyor e and carries on its end the hand-piece F, all in the usual manner.

Within the sections of the arm D are the powcr-transmittin g rods G, which at the hinge or joint d are united bythe flexible piece g of coiled wire, so that the sections of the arm may have their movement with relation to each other withoutinterfering with the transmission of the power. It will be observed that the joint at d is made of an open character, so as to avoid any interference, when bending, with the flexible connection g of the power-transmitting rods G. On the rear end of the rear section-rod, G, is a pulley, H, over which the driving-belt 7i passes, and whereby rotation is imparted through the rods G and flexible power-conveyer e to the chuck of the hand-piece. The rods G are journaled in the tubular arm and kept central by means of bearings I, fixed in the arm by screws t', and which are provided with holes fi', communieating with holes i?, made in the arm itself, so that the journals may be kept properly oiled.

From the foregoing description it will be seen that the crane-arm D may have three silnple movement-s and several combinations of these, resulting` in the most complete adaptation of the engine to all the positions in which it may be necessary to use it. In the first place, the arm may have an axial movement, which will enable it, in connection with the hinge at CZ, to have its outer section, which carries the hand-piece, turned to any angle in a vertical plane. rlhen,-through the vertical pivot-connection of the sleeve C, the arm may be turned to any point in a horizontal plane, and, in connection with the other movements, the hand-piece may be brought i-nto the most convenient position for working under all circumstances.

By the interposition ol the power-transmitting rods G in the tubular arm I am enabled t0 do away with all, the cumbersome external belting which is used in connection with many dental-engine brackets for transmitting the power to the hand-piece chuck. .In my machine the belting is only at the rear end and I use but a single pulley, in which respect the machine enjoys all the advantages of' simplicity which are to be found in the common engines.

Having thus described my invention, what I claim as new, and desire 1o secure by Letters Patent, Lisl. In a dental engine, the hand-piece and 'flexible power-conveyer, in combination with IOO the lfixed braeket,lil1e sleeve connected therel joint, d, the rods G Within the inibulir .fi-rin, with by a vertical pivot,tl1e arm carrying; the l connected with tl1epo\vereonveyer at one end hand-piece and eonveyer at. one end and fitF l and having L pulley at the other end, and the 15 ted at the other end in the Sleeve and axially l iexiblocoil or piece connecting 'alle rods ati-lle loi'flryi'lierein, and the hinge-joint in ille arm, binge of lille arm, Subsizln'ya'lly 1S deseribed.

Substantially as described. In Witness whereof I have hereunto Sei my.

2. In a` dental engine, the hund-piece and lmnfl.

the flexible power-Conveyer, in combination with the fixed bracket', the vertically-Pivoted n Sleeve, tbe tubular axially-rotary arm itted in i-lle sleeve and carrying tlieliand-pieee .find

power-PonVoyer, Said :lrnl 11n-vingL :i hinge- IRA LEEK.

rityneseesz W. F. SWASEY, CHARLES lill-[EAD 

